Proof of home ties is probably one of the biggest things you have to show and here is what I showed as proof of home ties for study permit.
While we were processing for my sister, the consultant was very adamant on showing a strong tie back to Nigeria as Canada does not joke with this for study permit application.
Things like land documents and properties, having family back home is what you can show as proof of home ties for study permit.
Outside of your letter of intent, I would say proof of home ties is probably the next most important thing to help narrate that WHY you want to come to Canada story and give evidence that you truly intend to go back to your home country after your studies in Canada and these are the things that ties you back to your home country.